Redis learning notes (continuously updating)

Redis

One 、Redis Installation and overview

1.1、 summary

Redis What is it? ？

Redis（Remote Dictionary Server ), Remote dictionary service ,

Redis It's an open source key-value The storage system , The hottest thing right now NoSQL One of the technologies .

1.2、 install

1. hold redis-6.2.6.tar.gz Upload to /opt Folder 
2. Check to see if there is gcc Compile environment  gcc --version
     If not, install  yum install gcc
3. decompression redis-6.2.6.tar.gz file  tar -zxvf redis-6.2.6.tar.gz
     After decompression, go to redis-6.2.6 Folder  cd redis-6.2.6
     Input does not contain parameters make Command to compile  make
     install redis make install

1.3 Check the installation directory

1.3.1、 The default directory ：/usr/local

1.redis-benchmark: Performance testing tools , You can run it in your own notebook to see how it performs

2.redis-check-aof: Recover the problem AOF file

3.redis-check-dump: Recover the problem dump.rdb file

4.redis-sentinel:Redis Cluster use

5.redis-server:Redis Server start command

6.redis-cli: client , Operation entrance

1.3.2、 Background start Redis

1、 Get into /opt, View directory , hold redis.conf Copied to the /etc The file named redis.conf

2、 Background settings daemonize no Change to yes

3、redis start-up Start command ：redis-server /etc/redis.conf

4、 View server processes ：ps -ef | grep redis

5、 Through the client link Redis command ：redis-cli

6、 close Redis:

• shutdown
• exit
• kill -9 3837

1.3.3、 Test performance

redis-benchmark It's a stress testing tool ！

redis-benchmark Command parameter

redis-benchmark [option] [option value]

Just test it ：

#  test ：100 Two concurrent connections  100000 A request 
redis-benchmark -h localhost -p 6379 -c 100 -n 100000

Two 、Redis key （key）

- keys  * ： View all in the current library key

- set key value : Add... To the current library key and value

- exists key ： Judge a certain key Whether there is 

- type key : View specified key Data type of 

- del key :  Delete specified key data 

- unlink key: according to value Select non blocking delete 

   Tight grip keys from keyspace Delete from metadata , The real deletion will occur in the subsequent asynchronous operations 

- expire key 10:10 Seconds is key Set expiration time 

- MOVE key db  Will be the current database of  key  Move to a given database  db  among .

- move name 1  Remove the current key

- PERSIST key  remove  key  The expiration time of ,key  Will last .

- RANDOMKEY  Returns a random... From the current database  key .

- RENAME key newkey  modify  key  The name of 

- TYPE key  return  key  The type of value stored .

- ttl key  See how many seconds are left to expire ,-1 Never expire ,-2 Indicates that it has expired 

- select  Command switch database 

- dbsize: Check the... Of the current database key The number of 

- flushdb: Empty the current library 

- flushall： Kill all the warehouses